Optical Fire Sensing Assembly (OFSA)

Standard Control Electronic Amplifier (SCEA) - TM-9-2350-287-10_353

TM-9-2350-287-10 Carrier Personnel Full Tracked Armored M113A3 2350-01-219-7577 (EIC AE7) Carrier Command Post Light Tracked M577A3 2350-01-369-6085 (EIC AE7) Manual
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TM 9-2350-287-10 CREW AFES COMPONENTS (continued) CAUTION Do not use high-pressure washing on AFES components. Moisture will contaminate electrical connections, which will result in failure of the system. Optical Fire Sensing Assembly (OFSA) OFSA consists of four sensor units located in the crew compartment, each using three infrared (IR) wave bands designed to detect hydrocarbon fuel fires. OFSA does not detect sunlight, electrical discharges, or lamps, flashes, fragmentation, or radiation from warheads or other battlefield activity. OFSA units are housed in individual shock-resistant aluminum casings mounted on brackets. OFSA units have built-in test equipment (BITE), which internally tests each unit for normal operation. BITE indicates a fault in the OFSA by lighting an LED on the T/A panel. The four OFSA units provide complete coverage of the crew compartment. 4-12

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